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SubjectRe: anyone ever done multicast AF_UNIX sockets?
Hi Chris,

Please check out the uml_switch
written by jeff dike for Mser Mode Linux.

It is a user-space program which emultates
an ethernet switch (or hub). It emulates
link-layer multicast on UNIX domain sockets.

Greg Daley

Chris Friesen wrote:
> It is fairly common to want to distribute information between a single
> sender and multiple receivers on a single box.
> Multicast IP sockets are one possibility, but then you have additional
> overhead in the IP stack.
> Unix sockets are more efficient and give notification if the listener is
> not present, but the problem then becomes that you must do one syscall
> for each listener.
> So, here's my main point--has anyone ever considered the concept of
> multicast AF_UNIX sockets?
> The main features would be:
> --ability to associate/disassociate a socket with a multicast address
> --ability to associate/disassociate with all multicast addresses
> (possibly through some kind of raw socket thing, or maybe a simple
> wildcard multicast address)
> --on process death all sockets owned by that process are disassociated
> from any multicast addresses that they were associated with
> --on sending a packet to a multicast address and there are no sockets
> associated with it, return -1 with errno=ECONNREFUSED
> The association/disassociation could be done using the setsockopt()
> calls the same as with udp sockets, everything else would be the same
> from a userspace perspective.
> Any thoughts? How hard would this be to put in?
> Chris

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